SLM成形Inconel 718合金的组织性能调控研究

Study on Regulation of Microstructure and Mechanical Properties of SLM-Processed Inconel 718 Alloy

针对Inconel 718合金零部件传统制造技术中存在的制造极限问题,基于材料合金显微组织与力学性能之间的相关性等内容,开展激光选区熔化(SLM)成形Inconel 718合金性能的研究,建立了适用于SLM成形Inconel718合金的热处理制度,提高了该合金的室温与高温力学性能。考虑到SLM成形Inconel 718合金组织内部晶粒极其细小、内应力积累较大,传统的热处理制度不再适合新技术成形的零部件,根据基体中二次相的析出温度区间,对该合金的传统后热处理制度进行改进。力学性能测试结果证明:项目组提出的均匀化热处理+固溶处理+双时效的热处理制度能有效改善SLM成形Inconel 718合金的显微组织和综合力学性能,并满足锻件的使用要求。

Aiming at the manufacturing limitation in the conventional technology of Inconel 718 alloy,based on the correlation between its microstructure and mechanical properties,the researches on the Inconel 718 alloy processed by selective laser melting(SLM)are carried out.Finally,the heat treatment scheme suitable for the SLM-processed Inconel 718 alloy is established,which improved its mechanical properties at room temperature and high temperature.Considering the finer grains and the large internal stress accumulating in the structure during the SLM process of Inconel 718 alloy,the conventional heat treatment scheme is no longer suitable for the innovative manufacturing technology.According to the precipitation temperature range of the secondary phase in the matrix,the heat treatment scheme is improved.The test for its mechanical properties shows that the innovative heat treatment scheme with homogenization treatment+solution treatment+double aging treatment can effectively improve its microstructure and comprehensive mechanical properties of the SLM-processed Inconel 718 alloy,and it meets the forging standards.